I have not seen any specimens of Myrica heterophylla from Delaware although it is listed in other floras as occurring there.

To distinguish between Myrica heterophylla and M . pensylvanica in the vegetative condition is difficult at best. Although M . heterophylla tends to have larger, persistent leaves (versus smaller, deciduous ones in M . pensylvanica ), the difference breaks down, especially in the northern portion of the range of M . heterophylla . Male specimens provide little help in resolving this problem because the inflorescences are virtually identical. Female specimens are most useful (essential?) for definitive delimitation because the ovary and young fruit (wall and protuberances) of M . pensylvanica are pubescent in contrast to the glabrous or sparsely glandular fruits of M . heterophylla . Whether these differences are sufficient to warrant the recognition of distinct species is yet to be satisfactorily resolved. W. M. Houghton (1988) attempted to settle this matter, eventually recognizing two subspecies in M . pensylvanica , but he did not examine floral features in his analysis. Again, I have taken the conservative route, leaving the question largely unanswered.